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28 lines
1.1 KiB
Markdown
28 lines
1.1 KiB
Markdown
# Grab All The Method Names Defined In A Ruby File
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I wanted a listing of all the methods defined in a Ruby file. Metaprogramming
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aside, I figured I could write a one-line `sed` script to effectively do this.
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```bash
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$ sed -n 's/[[:space:]]*def \([[:alnum:]_?!]*\).*/\1/p' file.rb
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```
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Let's break this down.
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- `[[:space:]]*` accounts for any level of indentation.
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- `def ` matches againts the start of a method definition.
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- `\(...\)` is a capture that can be referenced in the replace side of the
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script.
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- `[[:alnum:]_?!]*` represents the characters that can make up a Ruby method
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name, this is equivalent to writing `[a-zA-Z0-9_?!]*`.
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- `.*` is the final part of the regex match which ensures the rest of the line
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is loaded into the pattern space so that the replacement will only be the
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method name.
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- `\1` replaces everything in the first part of the script with the capture
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which is just the method name.
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- combining the `-n` and `p` flags ensures that only lines with substitutions
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are printed.
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This probably isn't perfect, but it is good enough to reference from time to
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time in my shell history.
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